Aqua regia is a mixture of HNO3 and HCl mixed in ratio of:
A. 3:1
B. 1:3
C. 2:3
D. 3:4
The chemical reaction "CaCO3 (g) CaO (g) + CO2 (g)" shows:
A. reduction.
B. oxidation.
C. no change in oxidation state.
D. both oxidation and reduction.
When electric current passes through an aqueous solution, which of the following ionic migrations is correct?
A. H+ ions move towards anode
B. Cl- ions move towards anode
C. Cl- ions move towards cathode
D. Both move towards cathode
What is the structure associate with BF3 molecule?
A. Linear
B. Triangle
C. Trigonal Pyramidal
D. Tetrahedron
Metals lose electrons more easily than non-metals because of:
A. high ionization potential.
B. high electron affinity.
C. low ionization potential.
D. low electron negativity.
The correct formula of 'Plaster of Paris' is:
A. CaSO4H2O
B. CaSO42H2O
C. CaSO43H2O
D. CaSO4. 紿2O
Yeast can be used to covert simple sugars into:
A. ethanoic acid and oxygen.
B. ethanol and oxygen.
C. ethanol and carbon dioxide.
D. starch and carbon dioxide.
Down's cell is used for manufacturing sodium because:
A. anode does not react with chlorine.
B. sodium floats on the fused sodium chloride.
C. graphite does not react with sodium.
D. it is easy to fix graphite in circular form.
The force restraining an object's motion on an inclined plane:
A. is directed into the plane.
B. may be friction.
C. is directed to sideways.
D. is always friction.
A person, standing in an elevator which goes up with constant upward acceleration, exerts a push on the floor of elevator whose value:
A. is always equal to his weight.
B. is always lesser than his weight.
C. is always greater than his weight.
D. is greater when his acceleration is than 'g'.
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